Quote from Ed Bott
There’s no SkyDrive synchronization. This one surprised me when I first discovered it. If you want to access files stored in your SkyDrive account, you’ll need to do so via a web browser or the built-in Windows 8 app, using a live Internet connection. The Windows desktop app that syncs files between a local drive and SkyDrive isn’t available for Windows RT. (You can open an Office document from SkyDrive, disconnect from the Internet, and continue editing it offline. The Office Upload Center will upload your changes later, when you reconnect.)
This no longer applies. Windows RT 8.1 OneDrive works identically to Windows 8.1.